<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <link rel="stylesheet" href="css/bootstrap.min.css">
    <script src="js/jquery-3.4.1.min.js"></script>
    <script src="js/bootstrap.bundle.min.js"></script>
    <script src="js/bootstrap.min.js"></script>
</head>

<body>
    <button type="button" class="btn btn-primary">Primary</button>
    <button type="button" class="btn btn-secondary">Secondary</button>
    <button type="button" class="btn btn-success">Success</button>
    <button type="button" class="btn btn-danger">Danger</button>
    <button type="button" class="btn btn-warning">Warning</button>
    <button type="button" class="btn btn-info">Info</button>
    <button type="button" class="btn btn-light">Light</button>
    <button type="button" class="btn btn-dark">Dark</button>
    <button type="button" class="btn btn-link">Link</button>

    <hr />
    <button type="button" class="btn btn-outline-primary">Primary</button>
    <button type="button" class="btn btn-outline-secondary">Secondary</button>
    <button type="button" class="btn btn-outline-success">Success</button>
    <button type="button" class="btn btn-outline-danger">Danger</button>
    <button type="button" class="btn btn-outline-warning">Warning</button>
    <button type="button" class="btn btn-outline-info">Info</button>
    <button type="button" class="btn btn-outline-light">Light</button>
    <button type="button" class="btn btn-outline-dark">Dark</button>

    <!-- .btn-block样式可以创建百分百充满空间的全屏按钮： -->
    <button type="button" class="btn btn-primary btn-lg btn-block">Block level button</button>
    <button type="button" class="btn btn-secondary btn-lg btn-block">Block level button</button>

    <!-- 
        启用状态
        .btn样式定义的按钮，默认就是启用状态（背景较深、边框较暗、带内阴影），
        如果你一定要使按钮固定为启用状态、不需要点击反馈，可以增加.active样式，
        并包括aria-pressed="true" 属性，则状态显示为启用状态。
        -->
    <a href="#" class="btn btn-primary btn-lg active" role="button" aria-pressed="true">Primary link</a>
    <a href="#" class="btn btn-secondary btn-lg active" role="button" aria-pressed="true">Link</a>

    <!-- 
        直接将disabled布尔属性添加到任何<button>元素（直接嵌套在html标签中，使按钮看起来处于非活动的禁用状态（点击不会有响应和弹性）。
    -->
    <a href="#" class="btn btn-primary btn-lg disabled" role="button" aria-disabled="true">Primary link</a>
    <a href="#" class="btn btn-secondary btn-lg disabled" role="button" aria-disabled="true">Link</a>

</body>

</html>